How to get read-receipt confirmation box in Outlook 2000 (Win2K platform)

I have Office2000 on a Win2K machine. Whenever someone sends me a mail with a read-receipt request, a receipt is sent to them from me automatically without a dialog confirmation box asking me whether I want to send a receipt or not.
I want to choose the mails to which I send the receipt. So, how do I make this confirmation box appear ?

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